%0 Journal Article %A Bisset, K. A. %T Evidence from the Cytoloǵy of Azotobacter chroococcum of a Relationship with Rhizobium and the Bacillaceae %D 1955 %J Microbiology, %V 13 %N 3 %P 442-445 %@ 1465-2080 %R https://doi.org/10.1099/00221287-13-3-442 %I Microbiology Society, %X SUMMARY: The structure of the cell envelopes in Azotobacter chroococcum and the behaviour and mode of formation of the spore-like cysts suggest that this organism has a close phylogenetic relationship with the Bacillaceae, and that accordingly the main genera of nitrogen-fixing bacteria, Azotobacter, Rhizobium, and Clostridium, have a relatively recent common origin. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-13-3-442